Echinoderms

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Transcript of Echinoderms

Echinoderms Echinoderms are invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system.Body Structure- have an endoskeleton-skin is stretched over the endoskeleton-made of plates, gives animal a bumpy texture-radial symmetry, usually multiples of fiveMovement They use their tube feet to move. Tube feet act like small, sticky suction cups. Move slowly. Obtaining Food-use their tube feet to capture food-move along slowly while catching food- most are carnivores, but some are omnivores -some eat algae and others eat shellfishStable ConditionsHabitat -they live in salt water-can't survive in fresh water-some prefer rocky others while others like sandy areas so they can bury themselvesEchinodermsReproduction-Almost all Echinoderms are male or female-Reproduce sexually and asexually-The female releases her egg and the male releases his sperm-The sperm fertilizes the egg-The fertilized eggs develop into swimming larvae-The larvae eventually undergo metamorphosis and become adult echinoderms-maintain stable conditions by homeostasis-adapt to match the color of their surroundings-all cold blooded, so they move where the sun isStrongylocentrotusPurpuratus (Purple Sea Urchin)- They are considered delecacies in Japan.- Spawn in the winter or early spring. - Most of the timethey are stationary.Ophiuroidea (Brittle Starfish)- Bury themselves for protection. - Their arms comeoff but grow back. - They are usually found in large numbers.Encope Michelini (Arrowhead sand dollar)- found in shallow parts of the ocean. - live for 6-10 years.- sand dollars are flattened sea urchins.Sources-http://www.arkive.org/purple-sea-urchin/strongylocentrotus-purpuratus/-http://www.montereybayaquarium.org/animal-guide/invertebrates/spiny-brittle-star-http://wiki.hicksvilleschools.org/groups/hsbiology/wiki/8168e/Arrowhead_Sand_Dollar.html--http://www.darwinsgalapagos.com/animals/echinodermata_echinoderms.htm-http://www.aboutfishonline.com/articles/brittle-stars.html-http://www.gwinnett.k12.ga.us/CooperES/Teacher_Websites/Watson_Web/5th_marine_biology_thursday/anniepurpleseaurchin.html-http://www.shells-of-aquarius.com/sand_dollars.html-http://www.seashells.org/sanddollars.html-http://echinodermsg.blogspot.com/2007/04/habitat-and-adaptations.html